SOHC.co.uk Forums > CB350/400

Holes in the frame??? anyone else suffered this

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ColCB400 4:
Got my frame back from the powder coaters and started building... like you do.
I noticed two holes have appeared just behind the swinging arm bolt, on the nearside both inside and out.
They are too neat to be corrosion... 5mm dia.
I think they are drain holes brazed up prior to painting during production.
I can use blanking grommits to seal them up, the location isn't structural so it shouldn't be a problem.

anybody else got annoying holes?
did the powder coater get too carried away when blasting?

matthewmosse:
I had my bike frame rot through- I don't remember what the first sighns were, I saw new holes so bashed it  with a slag hammer, and rapidly found a whole lot of rot. Not the end of the world, and I repaired it, including the begginings of structural rot.

Bitsa (Ralph Wright - RIP):
Guys
Have heard of this but luckily not experienced it.From what I remember reading about is early ones did not have drain holes somewhere in the bottom.So later ones had neatly drilled holes for water to come out.I have built 2x 750s and one 400 and like I said not had this problem but I dare say there are lots out there that have.
Cheers
Bitsa

Clem2112:
There are drain holes in the lower downtubes -  at the bottom , near the back as far as I can remember. Either there or in the cross tube near the  centre stand pivot.
Only reason for them was to let gases out when the frame was welded together.

Green1:
Both my k1's didn't have drain holes I pulled the gold bike onto its main stand 2 years ago and a weld broke.The frame tubes rotted inside out and are now wafer thin.(hoping to fix it this year)
I drilled to small drain holes in the frame to the green bike and was shocked how much water came out.

Mick

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